diffraction

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diffraction

[dĭ-frak´shun]

the bending or breaking up of a ray of light into its component parts.

dif·frac·tion

(di-frak'shŭn),

Deflection of the rays of light from a straight line in passing by the edge of an opaque body or in passing an obstacle of about the size of the wavelength of the light.

[L. dif- fringo, pp. -fractus, to break in pieces]

Farlex Partner Medical Dictionary © Farlex 2012

dif·frac·tion

(di-frak'shŭn)

Deflection of the rays of light from a straight line in passing by the edge of an opaque body or in passing an obstacle of about the size of the wavelength of the light.

[L. dif- fringo, pp. -fractus, to break in pieces]

Medical Dictionary for the Health Professions and Nursing © Farlex 2012

diffraction

Deviation of the direction of propagation of a beam of light, which occurs when the light passes the edge of an obstacle such as a diaphragm, the pupil of the eye or a spectacle frame. There are two consequences of this phenomenon. First, the image of a point source cannot be a point image but a diffraction pattern. This pattern depends upon the shape and size of the diaphragm as well as the wavelength of light. Second, a system of close, parallel and equidistant grooves, slits or lines ruled on a polished surface can produce a light spectrum by diffraction. This is called a diffraction grating. See Airy's disc; diffraction fringes; Maurice's theory.

References in periodicals archive ?

are mainly NLOS scenarios, with high influence of diffractions.

The agreement between the predictions for the path loss is more notable in the case of Ottawa, where the 3D ray-tracing propagation model based on image theory was applied, and less so for Cali and Valencia, where a 3D ray-tracing propagation model based on a brute-force algorithm or ray launching, including diffractions over rooftops, was applied.

Analysis of Heuristic Uniform Theory of Diffraction Coefficients for Electromagnetic Scattering Prediction

Previously the H-plane pattern has been computed using slope diffraction as the regular first-order diffraction in this plane is zero, but only over a dynamic range of 0-40dB.

The geometrical optics method is briefly reviewed in Section 2, followed by a detailed description of the Uniform Theory of Diffraction in Section 3.

Impact of finite ground plane edge diffractions on radiation patterns of aperture antennas

Generally speaking, odd-odd polyamides are assumed to be in the [gamma]-form at room temperature, characterized by one signal or two close diffractions at spacings in the range of 0.41-0.42 nm.

Investigation of odd-odd nylons based on undecanedioic acid. 2: crystal structures

The measured data were used to evaluate the diffraction loss prediction and train the neural network using training algorithm.

Diffraction Loss Prediction of Multiple Edges Using Bullington Method with Neural Network in Mountainous Areas

In this paper, an equalizing Dammann vortex grating (EDVG) is proposed by suppressing the even and zero diffraction order, which can be used to realize the uniform regulation of diffracted light intensity.

Optical Orbital Angular Momentum Demultiplexing and Channel Equalization by Using Equalizing Dammann Vortex Grating

In addition, the refilled CLC template grating shows different diffraction efficiencies for left- and right-handed circular polarization (LCP and RCP, respectively) in reflection and transmission modes.

Circular Polarization and Wavelength Selective Gratings Based on Holographic Cholesteric Liquid Crystal Templates

However, due to the small scale of the fault and the appear wave impedance difference between coal seam and surrounding rock (the average density and P-wave velocity of coal seam and surrounding rock are respectively as: [rho]1=1400Kg/m3, V1=2000m/s; [rho]2=2800Kg/m3, V2=3500m/s), the obvious diffraction could be formed in the process of seismic advanced detection in coal roadway, as shown in Figure 2.

Diffraction Characteristics of Small Fault ahead of tunnel face in coal roadway/Caracteristicas de difraccion de falla pequena en la calzada de carbon de un tunel

Regardless of the number of spikes, the amount of diffraction depends on the total area of the primary mirror obstructed by the spider vanes.

To curve, or not to curve: does a curved-vane spider really eliminate pointy stars?